specific heat capacity

Hess's Law

when several reactions can be added to give one overall reaction, the enthalpy change for the overall reaction is the sum of the enthalby change for the individual reactions
- reverse a reaction, reverse the enthalpy sign
- if you need to multiply a reaction, multiply it's enthalpy with the same number

chemical equilibrium

equilibrium constant

indicates the "extent" of the reaction
- large Keq means there are more products than reactants
- very large Keq means the reaction goes to completion
- small Keq means there are more reactants than products
- affected by temperature